Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 325mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke325 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-30
The AirTAC SAIJ40X325-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 325 mm nominal stroke by up to 30 mm for a precise 295-325 mm usable travel window. It delivers 628 N of push force at 0.5 MPa and features a SUS304 stainless steel rod for superior corrosion resistance. This extruded aluminum body utilizes PT tapered port threads (G1/4) and operates at speeds between 30 and 800 mm/s.
Because this model lacks a magnet, it relies on external sensing rather than embedded CMSE or DMSE switches. The rear adjuster acts strictly as a mechanical stop to fine-tune the retract position during commissioning; it is not a locking mechanism and cannot hold a load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 325 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×325 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-30 Is Used
Machine Changeover
Quickly adapt the 295-325 mm retract end-stop during product size changes on a packaging line without physically replacing the cylinder.
End-Position Tuning
Fine-tune the final resting position of tooling at commissioning using the rear screw, absorbing mechanical tolerances without adding external stops.
Variable Diverter Stroke
Adjust the pusher travel distance on a conveyor sorting system to accommodate different package depths on the fly.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-30 the Right Cylinder?
Choose this 40 mm bore when an application requires moderate thrust, stepping up from a 32 mm bore (402 N push at 0.5 MPa) but avoiding the bulk of a 50 mm bore (982 N). The adjustable stroke is ideal for product changeovers or setups requiring variable end-stops without swapping the physical cylinder for a fixed-stroke SAI variant. When replacing an ISO 15552 cylinder, match the 40 mm bore, 325 mm stroke, 30 mm adjustment, PT G1/4 port, and mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
With a 325 mm stroke, the 16 mm rod and M12x1.25 rod thread provide structural integrity, but long unsupported strokes still require an external guide to prevent excessive side-loading. For applications needing true load-holding without live air, consider the SAIL or BSAI variants instead of relying on the SAIJ adjuster.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-30 FAQ
The rear adjuster screw allows you to mechanically shorten the effective stroke by up to 30 mm, creating a usable travel window of 295 to 325 mm. It functions as a hard stop for end-position tuning and is not a lock.
At 0.5 MPa operating pressure, the SAIJ40X325-30 provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
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